diff options
| author |   Yaniv Gardi <ygardi@codeaurora.org> | 2016-02-01 15:02:49 +0200 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2016-02-23 21:27:02 -0500 |
| commit | e3dfdc532d5c68f343733b5315488763153ede2c (patch) | |
| tree | c42512eb4a235ef75db0367c947879b61afbe5f8 /drivers/scsi/ufs | |
| parent | scsi: ufs: add missing memory barriers (diff) | |
| download | linux-dev-e3dfdc532d5c68f343733b5315488763153ede2c.tar.xz linux-dev-e3dfdc532d5c68f343733b5315488763153ede2c.zip | |
scsi: ufs: commit descriptors before setting the doorbell
Add a write memory barrier to make sure descriptors prepared are
actually written to memory before ringing the doorbell. We have also
added the write memory barrier after ringing the doorbell register so
that controller sees the new request immediately.
Reviewed-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 1893a14f231e..2fc678d61fdc 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1625,6 +1625,8 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, hba->dev_cmd.complete = &wait; + /* Make sure descriptors are ready before ringing the doorbell */ + wmb(); spin_lock_irqsave(hba->host->host_lock, flags); ufshcd_send_command(hba, tag); spin_unlock_irqrestore(hba->host->host_lock, flags); |